Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Defeat Moloch the Demon Overlord.
Defeat 9 legions before they replicate.
Have your Elves deal 10000 points of damage.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Defeat Greenmuck and its minions.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Capture the attention of the mysterious crow.
Kill 15 Wererats before they sicken any soldier.
Defeat Ulguk-Hai the Troll Warlord.
Find the 5 legendary lost ice-shrooms.
Defeat 10 Troll Pathfinders while they're treading on ice.
Defeat Sarelgaz and its minions.
Do not let The Kingpin escape.
Defeat Gul'Thak and its minions.
Complete the campaign in Veteran mode.
Complete all iron stages.
Complete all heroic stages.
Drop 1.000 or more bomblets with the cluster bomb.
Kill 300 enemies with electricity.
Shoot 100 missiles.
Snipe 50 enemies.
Disintegrate 50 or more enemies.
Teleport 250 or more enemies.
Build 4 Tesla towers in any stage.
Throw 500 or more axes.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Earn 45 stars.
Kill 10 or more sheep with your hands.
Change soldiers' rally point 200 times.
Fire the Sunray 20 times.
Recruit max elves at The Silveroak Outpost.
Find the elusive acorn.
Find the ninja master rat.
Help Fredo escape.
Free the sasquatch on the Icewind Pass.
Summon 5 rock elementals in any one stage.
Polymorph 50 enemies into sheep.
Sell 30 towers.
Sell 5 towers in a single mission.
Have your soldiers survive the explosion of 300 demons.
Build all 8 towers specializations.
Complete the campaign.
Defeat Vez'nan.
Kill 10.000 enemies.
Hold 500 or more enemies with Wrath of the Forest.
Kill 50 enemies by poison damage.
Earn 30 stars.
Defeat J.T.
Have your soldiers regenerate a total of 50.000 life.
Have a single barbarian kill 10 enemies.
Train 1.00 soldiers.
Train a hero up to max level.
Have at least 3 Imperial Guards survive in the Citadel.
Send 1.000 soldiers to their deaths.
Defeat The Juggernaut
Earn 15 stars.
Upgrade all basic tower types to level3.
Build 150 towers.
Kill 100 enemies with meteor showers.
Build 100 towers.
Kill 2.500 enemies
Catch a fish.
Train a hero up to level 5.
Open 5 information cards.
Build 30 towers.
Call 10 waves early.
Use Rain of Fire 5 times in a single stage.
Kill 500 enemies.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.